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MCQs

Total Questions : 71 | Page 4 of 8 pages
Question 31. Efficiency of dilution decreases rapidly when the coefficient of dilution is ____________
  1.    0
  2.    1
  3.    <1
  4.    >1
 Discuss Question
Answer: Option D. -> >1
Answer: (d).>1
Question 32. The temperature of disinfection is inversely proportional to the killing of organisms.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 33. The chemical formula of hypoiodous acid is __________
  1.    H₂IO
  2.    H₂I
  3.    HIO
  4.    HI₂
 Discuss Question
Answer: Option C. -> HIO
Answer: (c).HIO
Question 34. When the coefficient of dilution is 1, then which of the following statement is correct?
  1.    Time of contact is more important than dosage
  2.    The dosage is more important than time of contact
  3.    Concentration and time are equally important
  4.    Efficiency of dilution decreases.
 Discuss Question
Answer: Option C. -> Concentration and time are equally important
Answer: (c).Concentration and time are equally important
Question 35. At what pH, the dissociation of hypoiodous acid takes place?
  1.    1
  2.    2
  3.    3
  4.    4
 Discuss Question
Answer: Option D. -> 4
Answer: (d).4
Question 36. What happens to the hypoiodous acid when the pH is over 8?
  1.    HIO is stable
  2.    Formation of hypoiodite ion takes place
  3.    Formation of iodine and hypoiodite ion takes place
  4.    Formation of iodine and iodate takes place
 Discuss Question
Answer: Option D. -> Formation of iodine and iodate takes place
Answer: (d).Formation of iodine and iodate takes place
Question 37. The chemical formula of iodate is __________
  1.    HIO₃
  2.    HIO
  3.    HIO₂
  4.    H₂IO₂
 Discuss Question
Answer: Option A. -> HIO₃
Answer: (a).HIO₃
Question 38. Iodine is a better disinfectant to kill virus than hypoiodous acid.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 39. What happen to the concentration of iodine when the pH is between 6 and 8?
  1.    I₂ decreases whereas HIO increases
  2.    I₂ increases, whereas HIO decreases
  3.    Both I₂ and HIO increases
  4.    Both I₂ and HIO decreases
 Discuss Question
Answer: Option A. -> I₂ decreases whereas HIO increases
Answer: (a).I₂ decreases whereas HIO increases
Question 40. A HIO + b OH⁻ <=> HIO₃ + b H₂O + b I⁻. What are the values of a and b respectively in the above equation?
  1.    1, 2
  2.    1, 3
  3.    3, 2
  4.    3, 1
 Discuss Question
Answer: Option C. -> 3, 2
Answer: (c).3, 2

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